Please for the help: how to add to Expert Advisor pointers (arrows) showing coming into being of trading conditions (but not the concrete transaction!). This would be very useful for the purpose of the visual presentation of the rightness of the prompt from the EA under of tests before transactions.

I know that one can add pointers to indicators using code:

//---- indicator line
IndicatorBuffers(2);
SetIndexStyle(0,DRAW_ARROW);
SetIndexArrow(0,233);
SetIndexStyle(1,DRAW_ARROW);
SetIndexArrow(1,234);
........
But what to make, if EA uses with several indicators. Then pointers would be added to EA code. Please for the help how can I make this.